Significantly improve leaderboard performance

[danlamanna]

No description provided.

[Copilot]

Pull Request Overview

This PR optimizes the leaderboard query performance by replacing ORM object fetching with dictionary-based queries using .values() and switching from the standard library json module to the faster orjson library.

• Replaces ORM model queries with .values() to return dictionaries instead of model instances
• Adds orjson dependency for faster JSON serialization
• Updates templates and tests to access dictionary keys instead of object attributes

Reviewed Changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
stade/core/views.py	Optimizes leaderboard query to use .values() for dictionary output; implements manuscript URL generation using S3FileField; switches to orjson for JSON serialization
stade/core/tests/test_leaderboard.py	Updates test assertions to access dictionary keys instead of object attributes
stade/core/templates/leaderboards.html	Updates template to use dictionary key syntax for submission data
setup.py	Adds orjson dependency
requirements.txt	Pins orjson version to 3.11.4

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